package com.whcoding.test.common.encrypt;

import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * @program: spring-boot-learning
 * @description:Java 原生SH256 加密
 * @author: whcoding
 * @create: 2022-05-25 14:44
 **/
public class SHA256Util {

	public static String getSHA256Str(String str) {
		MessageDigest messageDigest;
		String encodeStr = "";
		try {
			messageDigest = MessageDigest.getInstance("SHA-256");
			messageDigest.update(str.getBytes(StandardCharsets.UTF_8));
			encodeStr = byte2Hex(messageDigest.digest());
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
		return encodeStr;
	}

	/**
	 * 将byte转为16进制
	 *
	 * @param bytes
	 * @return
	 */
	private static String byte2Hex(byte[] bytes) {
		StringBuffer stringBuffer = new StringBuffer();
		String temp = null;
		for (int i = 0; i < bytes.length; i++) {
			temp = Integer.toHexString(bytes[i] & 0xFF);
			if (temp.length() == 1) {
				//1得到一位的进行补0操作
				stringBuffer.append("0");
			}
			stringBuffer.append(temp);
		}
		return stringBuffer.toString();
	}
}
